*{
	margin: 0px;
	padding: 0px;
}
h3{
	width: 200px;
	height: 30px;
	margin: 20px auto;
	text-align: center;
	line-height: 30px;
}
#tb{
	margin: 20px auto;
	border-collapse: collapse;

}
#tb td{
	border: 1px solid #000;
	width: 40px;
	height: 40px;
	padding: 5px;
	text-align: center;
}